License

CC-BY-NC-SA 3.0

Tesseract Guitar Practice Amp

3 years ago 10082
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  • Documents
  • BOM
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Description

The EasyEDA "Tesseract" DIY Guitar Practice Amplifier is an LM386 based low power amplifier designed to deliver up to about 500mW into an 8 Ohm speaker when run from a 9V battery.

Tesseract can be heard on YouTube here:

https://youtu.be/9XzodyefyV8

The design given here - which includes a complete PCB design and Bill of Materials - is highly flexible and allows the several options in both the build and use of the amplifier.

As well as a clipping circuit that some other designs - such as the more well known Smokey, Little Gem, Ruby and Noisy Cricket - have incorporated, Tesseract has several unique effects features designed into it:

  • Selectable Bipolar or Junction FET input stage for different input overload effects;

  • Adjustable gain and clipping 'hardness' in the Distortion stage;

  • An adjustable fullwave rectifier stage, driven by the distortion output, that generates a type of fuzz and frequency doubling effect called 'Wreckage';

  • An optional low frequency oscillator stage to sweep the Wreckage effect;

  • A simple mixer to blend the 'Wrecked' and the 'Distortion' outputs;

  • Selectable, adjustable low or high frequency boost (a type of tone control);

  • An important aspect of the design is that all the features and FX can be tweaked for your delight and delectation.

  • Most features are also optional and can be wire linked out if not required without affecting the other functions.

  • The design could easily be modified to suit the LM380 2.5W or LM384 5W amplifier chips (although the Boost function would have to be omitted) or a range of other devices.

  • The design also includes a headphone output jack.

  • The PCB includes dual footprinting to simplify the choice of some of the components.

  • All parts (excluding the PCB) are available from: http://www.bitsbox.co.uk/ (Bitsbox can also supply suitable small switches, loudspeakers and battery holders or clips.) An alternative for J1 as an MPF102 is available from: http://www.tandyonline.co.uk/components/semiconductors/transistors/mpf102-jfet.html

  • Simulations of the different stages of this amplifier - and a copy of the EasyEDA LM386EE spice model used in them - can be found here:

https://easyeda.com/example/Tesseract_Guitar_Practice_Amp_simulation_files-H0ca8IFDB

To order Tesseract PCBs direct from EasyEDA

Sign up for a free account at:

https://EasyEDA.com

then click on 'Fork' or 'Open in Editor' in the upper right of this page and then click on the Fabrication Output... button on the top toolbar of the PCB layout tab:

Fabrication Output...

Then click on the Save To Cart button on the Add To Cart page:

Save To Cart

Then follow the instructions on the

Home > My Account> Cart

page.

Orders can be tracked on the

Home > My Account> History Orders

page.

To download Gerbers for 3rd party PCB fabrication

Click on 'Open in Editor' in the upper right of this page and then click on the Fabrication Output... button on the top toolbar of the PCB layout tab:

Fabrication Output...

Then click on the Download Gerber Files button on the Add To Cart page:

enter image description here

  • Please note that this project is subject to the CC-BY-NC-SA 3.0 license. For more information please see:

https://creativecommons.org/licenses/by-nc-sa/3.0/

Documents

Tesseract Guitar Practice Amp Schematic

Tesseract Guitar Practice Amp PCB

BOM

ID Name Designator Footprint Quantity Manufacturer Part Manufacturer Supplier Supplier Part Price LCSC Assembly Mounted Bitsbox Order Code Description
1 10k R15,R14,R2,R7,R26,R24,R1 RC07 7 Various MR2510K 10k 250mW Metal Film 2% or better.
2 51k R12,R4,R5,R8,R27,R31,R21,R11 RC07 8 Various MR25100K 100k 250mW Metal Film 2% or better.
3 100p C9 C_MLCC_RES_DIP_5.5x3mm_P5mm 1 Various NPO100P 100pF 16V ceramic capacitor. 5mm pitch resin dipped MLCC or similar.
4 2N5458 J1 TO-92 1 2N5458 QD071 2N5458 N channel JFET in TO-92 package.
5 BC547 Q1,Q2,Q3,Q4,Q5,Q6,Q7 BC547 7 BC547B QD011 BC547 NPN BJT in TO-92 package.
6 1Meg R3,R17,R16,R32,R36,R37,R19 RC07 7 Various MR251M 1M 250mW Metal Film 2% or better.
7 1Meg_LOG RV2,RV1 POT_BITech-TTE_P160KN 2 Various VR045 1M Log pot. PCB mount like: http://www.bitechnologies.com/pdfs/p160.pdf
8 10p C5 C_MLCC_RES_DIP_5.5x3mm_P5mm 1 Various NPO10P 10pF 16V ceramic capacitor. 5mm pitch resin dipped MLCC or similar.
9 100k R6,R29,R28,R33,R30,R18,R9,R34,R35,R20 RC07 10 Various MR25100K 100k 250mW Metal Film 2% or better.
10 SWITCH_SPDT SW2,SW3 HDR1X3 2 Just 3 off PTH SW057 SPDT switch wired to holes in PCB.
11 10k_LIN RV4 POT_BITech-TTE_P160KN 1 Various VR004 10k Lin pot. PCB mount like: http://www.bitechnologies.com/pdfs/p160.pdf
12 BC557 Q8 BC557 1 BC557B QD013 BC557 PNP BJT in TO-92 package.
13 DNF_51k R10 RC07 1 Various DO NOT FIT IF SW2 AND LFO PARTS FITTED (10k 250mW Metal Film 2% or better.)
14 SWITCH_DPDT SW1 HDR1X6 1 Just 6 off PTH. SW035 DPDT switch wired to holes in PCB.
15 47n C17,C24,C8,C2,C18,C14 C_MLCC_RES_DIP_5.5x3mm_P5mm 6 Various CC003 47nF 16V ceramic capacitor. 5mm pitch resin dipped MLCC or similar.
16 10R R22,R13,R25 RC07 3 Various MR2510R 10R 250mW Metal Film 2% or better.
17 100k_LOG RV6,RV7 POT_BITech-TTE_P160KN 2 Various VR085 100k Log pot. PCB mount like: http://www.bitechnologies.com/pdfs/p160.pdf
18 22n C19 C_MLCC_RES_DIP_5.5x3mm_P5mm 1 Various CC008 22nF 16V ceramic capacitor. 5mm pitch resin dipped MLCC or similar.
19 1u C11,C16,C10,C22,C15,C7,C6,C4,C3,C1,C12,C26 C_ALUnTANT_D6n9mm_P1.5-5mm 12 Various HC1U063 1uF 16V electrolytic capacitor. 5mm pitch resin dipped tantalum or 1.5mm to 2.5mm aluminium.
20 220u C20 C_ALUnTANT_D6n9mm_P1.5-5mm 1 Various LC220U35 220uF 16V electrolytic capacitor. 5mm pitch resin dipped tantalum or 1.5mm to 2.5mm aluminium.
21 47u C21,C23,C13,C27,C28 C_ALUnTANT_D6n9mm_P1.5-5mm 5 Various LC47U25 47uF 16V electrolytic capacitor. 5mm pitch resin dipped tantalum or 1.5mm to 2.5mm aluminium.
22 LED D1 LED3MM 1 Any 3mm lead spacing LED. (Almost any LED can be fitted if the leads are bent or wired to the PCB) OP009 Red 3mm LED with approx 2V forward drop.
23 10k_LOG RV5,RV3 POT_BITech-TTE_P160KN 2 Various VR099 10k Log pot. PCB mount like: http://www.bitechnologies.com/pdfs/p160.pdf
24 1k R23,R38 RC07 2 Various MR251K 1k 250mW Metal Film 2% or better.
25 SIP2 P1,P2 HDR1X2 2 Just 2 off PTH Wires can go straight to PCB.
26 LM386 U2 DIP08 1 LM386N-3 QU206 LM386 low power audio amplifier in 8 pin DIP package.
27 6.35mm_switched_3_pole_jack_skt_w-mono_plug SKT1 6.35mm_switched_3_pole_jack_skt_Neutrik_NMJ6HFD2 1 Neutrik NMJ6HFD2 or similar CN057 6.35mm switched 3 pole jack socket Neutrik NMJ6HFD2 showing use as power switch with mono plug.
28 6.35mm_switched_3_pole_jack_skt_Neutrik_NMJ6HFD2 SKT2 6.35mm_switched_3_pole_jack_skt_Neutrik_NMJ6HFD2 1 Neutrik NMJ6HFD2 or similar CN057 6.35mm switched 3 pole jack socket Neutrik NMJ6HFD2.
29 TL084N U1,U3 DIP14 2 TL084CN QU111 TL084 quad opamp in 14 pin DIP package.
30 WIRE_LINK_or_SoT_CAP C25 C_MLCC_RES_DIP_5.5x3mm_P5mm 1 Various - Wire link or user choice of capacitor.
31 unplated_M3_clearance_hole 3M5_H1,3M5_H2,3M5_H3,3M5_H4 hole_3mm5 4 n/a You don't have to buy these: they come free with the PCB.

Attachments

Filename Download
Tesseract_front_view.JPG
bare_pcb_solder_side.JPG.JPG
Tesseract_back_view.JPG
DSC05051.JPG
Tesseract_top_view.JPG

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你现在访问的是EasyEDA海外版,使用建立访问速度更快的国内版 https://lceda.cn(需要重新注册)
如果需要转移工程请在个人中心 - 工程 - 工程高级设置 - 下载工程,下载后在https://lceda.cn/editor 打开保存即可。
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